metcalee



R. F. METCALFE.

CONTROLLING DEVICE FOR BOILER FURNACES.

APPLxcATIoN FILED JULY 25,1919.

1,422,369, y Patented July 11, 1922.

2 SHEETS-SHEET I.

R. F. METCALFE- CONTROLLING DEVICE F0`R BOILER FURNACES.

APPLICATION FILED'JULY 25. |919.

PATENT 055116332.

ROBERT F. METCALFE, OF ERIE, PENNSYLVANIA.

. CONTBOLLING DEVICE FOR BOILER FURNACES.

messes.

Specification of Letters Patent.

Patented July 11, 1922.

Application filed July 25, 1919. Serial No. 313,419.

To all ifi/0m it may concern."

Be 1t known that I, ROBERT l". METGALFE,

a citizen of the United States, residing at Erie, in the county of Erie and State of Pennsylvania, have invented new and useful Improvements in Controlling Devices for Boiler Furnaces, of which the following is a specification.

This invention relates tocontrolling devices for boiler furnaces and consists in certain imi'irovements in the construction thereof as will be hereinafter fully Vdescribed and pointed out in the claims.

The invention is particularly designed for use in boiler furnaces injecting liquid fuel with compressed air.

The invention isillustrated Lin the accompanying drawings as follows:-

Fig. 1 shows a diagram of the-apparatus in place.

Fig. 2 a section of the air controlling device, the cover of the valve chest being removed to better show construction.

Fig. 3 a section on the line 3 3 in Fig'. 2.

Fig. 4 a sectionon the line 444 in Fig. 2.

Fig. 5 a view of a second burner;

l'marlrs the boiler, 2 the boiler-furnace, 3 one burner, 4 the fuel supply tank, 5 the fuel and air jet, y5A apipe leading from the fuel supply tank to the jet, 7 thev air pipe leading to the jet, 6 a pipe"V connecting the pipe 7 with theair controldevicev 13, 8 an air tanlr, 9 a compressor supplying air to the air tanlr bymeans of a pipelO, 11 a pipe connecting the airtank with an air controlling device 13, and 12 a throttlevvalve in the air pipe 11. Preferably there is a plurality of burners. These are in alinement and an air supply pipe 6A leads to a second burner 3A and a fuel supply pipe 5B leads to the second burner. The two burners are exactly alike each having a jet 5 to which the pipe 7 leads, the burners being of any desired construction.

A pipe 14 leads from the steam space of the boiler to the air controlling device. The air controlling device is mounted on a frame 15. This terminates at its lower end in a flange 16 on which is mounted a diaphragm 17. A plate 18 is arranged over the dia phragm forming a pressure chamber 19. The pipe 14 delivers steam under boiler pressure to the chamber 19 in position to operate on the diaphragm. A stemr20 extends upwardliY from the diaphragm and is moved as the diaphragm moves. A spring 21 resists the movement of the diaphragm, or in other words, opposes the boiler pressure. This spring is seated on a collar 22 loosely mounted on the stem 20 and an adjusting screw 2,3 is provided by means of which the tension of the spring 21 may be varied. The stem'20 extends through a gland 24 in the 'frame 15 and into a valve chamber 25. The stem 2O operates against a lever 26, the le ver being mounted on the pin 27. The end 280i* the lever operates on a valve lever 29, the valve lever being mounted on a pin 30. It will be readily observed that the lever 26 is so arranged with relation to its point of operation on the lever V29 and the point of operation of the stem 2O that it gives to the end of the lever 29 a greater movement than that of the stem 20. uThis is desirable in that it permits of the use of the diaphragm without subjecting thev diaphragm the valve chest and the openings 38 and 39 form valve passagesbetween the valve chest and these chambers. The pipe 6 extends from the chamber 36 and the pipe 6^ from the chamber 37.

When the pressure in the boiler exceeds thev desired normal the valve 34 is moved covering more or less of the openings 38 cutting off a portion of the air to the first burner 3. If the pressure continues to rise it closes off all the openings 38 and more or less of theopenings 39, thus reducing the fire in the second burner. On the reduction of pressurev in the boiler the return movement of the valveV due t0 the yielding of the diaphragm under the inliuence of the spring 21 opens the openings 39 and then the openings 38 so as to increase the lire.

It is desirable to maintain combustion in the burners with as small a fiame as possible -so that there may be no trouble with pre ignition when the burners are again put into normal operation. This is accomplished with relation to the first burner 3 by extending a bypass from the bottom of the valve chest to the chamber 36. This bypass may be adjusted by the valve 41 so as to deliver just suiicient air to maintain combustion in the first burner. A similar by ass 42 ex-v tends from the valve chest to t e chamber 37 and is controlled by a valve 4B and operates in the same Way as the bypass l0.

The valve 34 is preferably yieldingly and for the air comprising a valve chest having a valve face therein with a series of controllin passages through the face; a valve moun to slidingly operate over said Lface und to successively operate on said openings; a pressure -device controlled by boiler pressure; and meams actuated by the pressure device to actuate said valve.

2. In a controlling device yfor boiler furnaces, the combination ofaboiler; aburner leading to said boiler; moensfor supplying air to said burner; and a controlling device for the air comprising a valve chest having a valve 4face therein; a valve ewingingly mounted in the valve chestto operate over said valve face; a pressure device controlled by boiler pressure; and meainsfactuated by the pressure device and acting on said mounting for operating suidvalve.

3. In a controlling device for boiler Tiurnoces, thercombination ofrafboiler.; a plurality :of burners leadingto'sidboiler.; means for supplying air to said burnersyaaid a controlling device for the air oomprisinga'pressure device controlled by the boiler pressure; and mechanism controlled byithe'pmssure device `forsuccessively varying the supply' to said burners. l

'4. In a controlling device for'boiler furnaces, the combination of a boiler; a plurality of burners leading to said boiler; means flor supplyingair to said burners; and a controlling device .for .the air comprising a pressure device contrlled by the boiler pres sure; mechanism controlled by the pressure device for successively varying tltesupply to lsaidburners;and devices for supplylng air to said burners irrespective of the position of said mechanism suieient to maintain P""bnsttion 5. In a eontrollingdevice `for boiler furnaces, the combination of a boiler; a burner heating said boiler; `moans for supplying airto Vsaid burner; .and a-controlling device for the air comprising a diaphragm subjected to the boiler pressure; a valve controlling the air; a lever actuating the valve; a second levenactuatingthe first lever; and means for communicating the movement of the diaphragm to the secondlever.

6. In a controlling device for boiler furnoces, the combination of a boiler; a burner heating'said boiler; means for supplying air to said burner; a controlling device for the wir comprising a valve chesthaving a valve 'face thereon; a. valve lever having a pivotal mounting at rightanglestothe `plane of the valve face; a valve yieldingly mounted on the lever and operating on seid :face as the lever sweeps overzthe fece; and a pressure device controlled by boiler pressure actuatiny id lever.

In a controlling devicelfor boiler 'furnaces, the combination of a boiler; a burner heating' said boiler; means for supplying air to said burner; `a'eontrolling device ffor the aircomprising a valve chestibavng a valve foce thereon; la walve' lever; o valveiyieldingly and rotatively mounted .Unibo lever operating oneaidffaace; and afprere device controlled by boiler `pressure actuating said lever.

In testimony -whereof I have hereunto Vset myhand.

ROBERT F. 

